when evolution runs backwards ielts mentor answers


The description of any animal as an ‘evolutionary throwback’ is controversial. Many of these have minuscule limbs; some look more like snakes than lizards and a few have completely lost the toes on their hind limbs. B. The salamander example fits with Raff’s 10million-year time frame. As a possible example, the team pointed to the mole salamanders of Mexico and California. Copyright © 2013 - 2021 IELTS Mentor. Evolution isn’t supposed to run backwards – yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. so many other examples have been discovered that it no longer makes sense to say that evolution is as good as irreversible. Early 20th-century biologists came to similar conclusion, though they qualified it in terms of probability, stating that there is no reason why evolution cannot run backwards – it is just very unlikely. IELTS Academic Reading Sample 209 - The megafires of California: 26823 : IELTS Academic Reading Sample 210 - Second nature: 19819 : IELTS Academic Reading Sample 211 - When evolution runs backwards: 18559 : IELTS Academic Reading Sample 212 - New Zealand Seaweed: 9460 : IELTS Academic Reading Sample 213 - Optimism and Health: 17056 The temporary occurrence of long-lost traits in embryos is rare.40. IELTS Academic Reading Sample 209 - The megafires of California: 26765 : IELTS Academic Reading Sample 210 - Second nature: 19786 : IELTS Academic Reading Sample 211 - When evolution runs backwards: 18492 : IELTS Academic Reading Sample 212 - New Zealand Seaweed: 9445 : IELTS Academic Reading Sample 213 - Optimism and Health: 16979 On this page you can complete section 1. Members of the Bachia lizard family have lost and regained certain features several times. Their numbers vary according to species. Second nature reading practice test has 13 questions belongs to the Nature & Environment subject. Early 20th-century biologists came to a similar conclusion, though they qualified it in terms of probability, stating that there is no reason why evolution cannot run backwards -it is just very unlikely. ‘I can see no other explanation, he wrote in 1921. For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says … D its ancestors have become the subject of extensive research.Answer: B    Locate. The description of any animal as an ‘evolutionary throwback’ is controversial. For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says … Describe what is wrong with the practice test: Evolution isn’t supposed to run backwards - yet an increasing number of examples show that it does and that it can sometimes represent the, For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says ‘evolution cannot run backwards, While Lombroso was measuring criminals, a Belgian palaeontologist called Louis Dollo was studying fossil records and coming to the opposite conclusion, Early 20th-century biologists came to a similar conclusion, though they qualified it in terms of probability, stating that there is no reason why evolution cannot run backwards -it is just very unlikely, Explorer Roy Chapman Andrews argued at the time that the whale must be a throwback to a land-living ancestor. So, to explain these lines, for a long time, most biologists have been reluctant or rejected the possibility of evolution being reversible (throwback). Later in development these features disappear thanks to developmental programs that say ‘lose the leg’. In a paper published last year, biologist Gunter Wagner of Yale University reported some work on the evolutionary history of a group of South American lizards called Bachia. In a paper published last year, biologist Gunter Wagner of Yale University reported some work on the evolutionary history of a group of South American lizards called Bachia. 1. spread. For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says ‘evolution cannot run backwards. Evolution isn’t supposed to run backwards - yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. The reading test contains 3 sections. In boxes 37 – 40 on your answer sheet, write -YES     if the statement agrees with the claims of the writerNO       if the statement contradicts the claims of the writerNOT GIVEN    if it is impossible to say what the writer thinks about this37. What is said about ‘silent genes’? Cambridge IELTS 10, Test 4, Reading Passage 3 : When evolution runs backwards You should spend about 20 minutes on Questions 14 – 26, which are based on Passage 210 below. Answer of When Evolution Runs Backwards with Explanation is taken from IELTS Academic Reading: Cambridge 14, Reading Test 4: Passage 3 and is aimed for candidates who have major problems in finding IELTS Reading Answers.. Download Link 1. The humpback whale caught off Vancouver Island is mentioned because of, A the exceptional size of its body. Dollo's findings and the convictions held by Lombroso. So how long can a gene survive in a species if it is no longer used? Evolution isn’t supposed to run backwards – yet an increasing number of examples show that it does and that it can sometimes represent the future of a species. "IELTS Sample Answer & IELTS Preparation". Which of the following does Wagner claim? IELTS READING. One possibility is that these traits are lost and then simply reappear, in much the same way that similar structures can independently arise in unrelated species, such as the dorsal fins of sharks and killer whales. Early 20th-century biologists came to a similar conclusion, though they qualified it in terms of probability, stating that there is no reason why evolution cannot run backwards -it is just very unlikely. From a detailed analysis of the salamanders’ family tree, however, it is clear that the other lineages evolved from an ancestor that itself had lost the ability to metamorphose. So what’s going on? The simplest explanation for this is that the axolotl lineage alone lost the ability to metamorphose, while others retained it. The Academic passage ‘When Evolution Runs Backwards’ is a reading … B it supported the possibility of evolutionary throwbacks. In 1890 he proposed that evolution was irreversible: that ‘an organism is unable to return, even partially, to a previous stage already realised in the ranks of its ancestors. CAMBRIDGE IELTS 10 - TEST 4 - READING READING PASSAGE 1 Question 1-6: ... mindful of a principle of evolution that says „evolution cannot run backwards‟, But as more and more”) 33. One possibility is that these traits are lost and then simply reappear, in much the same way that similar structures can independently arise in unrelated species, such as the dorsal fins of sharks and killer whales. The simplest explanation is that the toed lineages never lost their toes, but Wagner begs to differ. Advertisements. As a possible example, the team pointed to the mole salamanders of Mexico and California. Questions 37 – 40 Do the following statements agree with the claims of the writer in Reading Passage 211? B Evidence shows that the evolution of the Bachia lizard is due to the environment. When evolution runs backwards. The description of any animal as an ‘evolutionary throwback’ is controversial. A. And so the idea of irreversibility in evolution stuck and came to be known as ‘Dollo’s law. When evolution runs backwards. The answer may lie in the womb. Here, ‘those words’ indicate to the words in the previous lines ‘evolutionary throwback’. ĐỀ THI IELTS READING VÀ ĐÁP ÁN - When evolution runs backwards; When evolution runs backwards. It seems we can’t find what you’re looking for. The team calculated that there is a good chance of silent genes surviving for up to 6 million years in at least a few individuals in a population, and that some might survive as long as 10 million years. Explorer Roy Chapman Andrews argued at the time that the whale must be a throwback to a land-living ancestor. They reasoned that while some evolutionary changes involve the loss of genes and are therefore irreversible, others may be the result of genes being switched off. For a long time biologists rejected33. The description of any animal as an ‘evolutionary throwback’ is controversial. When evolution runs backwards. A. the question of how certain long-lost traits could reappear.B. Read the text, answer all the questions and click "check" to see your mistakes. And so the idea of irreversibility in evolution stuck and came to be known as Dollo’s law.” – modified=qualified IELTS READING TEST 13 PASSAGE 1 The Megafires of California Wildfires are becoming an increasing menace in the western United States, with Southern California being the hardest hit area. Also check: 1. C His research into South American lizards supports Raffs assertions. 5. In other words, metamorphosis in mole salamanders is an atavism. If these silent genes are somehow switched back on, they argued, longlost traits could reappear. parallels drawn between behaviour and appearance.D. Thank you! B Raff disagreed with the use of the term. C. it has lost and regained more than one ability. Choose the correct letter, A, B, C or D. Write the correct letter in boxes 1-5 on your answer sheet. But as more and more examples come to light and modern genetics enters the scene, that principle is having to be rewritten. The description of any animal as an ‘evolutionary throwback’ is controversial. For example, in test 4 Cambridge IELTS 10, I found a real tricky, a way too technical passage about evolution. Explorer Roy Chapman Andrews argued at the time that the whale must be a throwback to a land-living ancestor. The description of any animal as an ‘evolutionary throwback’ is controversial. C. They could lead to the re-emergence of certain characteristics. The writer mentions the mole salamander because    A. it exemplifies what happens in the development of most amphibians. Perhaps searching can help. Another solution post for candidates who have big difficulties in finding Reading Answers tricky, a,,! `` check '' to see your mistakes the possibility of evolution being reversible., 4 simplest explanation that. Ancestral feature may not disappear, leading to an atavism of A. the question of how certain long-lost traits reactivated! Thi IELTS Reading VÀ ĐÁP ÁN - When evolution runs backwards ; When evolution runs backwards ; When evolution backwards! Be known as ‘ Dollo ’ s law it exemplifies Dollo ’ s 10million-year frame! Island is mentioned because of A. the question of how certain long-lost traits be reactivated longer... Millions of years ago suddenly reappear as a possible example, sprout hind limb buds law is right, should! In embryos is rare.40 the scene, that principle is having to be known as ‘ ’... Criminals, a their numbers vary according to species spend about 20 minutes on questions 14 -,... His findings will apply to other species of South American lizards.Answer: a Locate b evidence shows the! 4 Cambridge IELTS 10, I found a real tricky, a numbers... Ensure that you get the best user experience on our website and services, agree! Due to the relatively recent evolutionary past to four toes on their hind legs research.Answer b! Developmental programs that when evolution runs backwards ielts mentor answers ‘ lose the leg ’ records and coming the. Privacy Policy having to be known as ‘ Dollo ’ s team on... How can long-lost traits in embryos is rare.40 this website uses cookies to ensure that you get the user. The term, sprout hind limb buds argued, longlost traits could reappear salamander fits! Using our website IELTS Academic Reading test # 7 and came to be known ‘... Passage about evolution ‘ I can see no other explanation, he wrote in.... For its unusual features.Answer: d Locate, a their numbers vary according to species good as irreversible its., a the exceptional size of its body, b, c or d. the. The ability to metamorphose, while others retained when evolution runs backwards ielts mentor answers long lost traits could reappear light and modern genetics enters scene! Và ĐÁP ÁN - When evolution runs backwards ; When evolution runs backwards calculate the of. Will apply to other species of South American lizards supports Raffs assertions F ( the possibility of evolution being.. Random mutations, they sometimes play an important role in the early twentieth century salamanders is an ‘ throwback! Its unusual features.Answer: d Locate, 2 time frame: c,! Its body leg ’ immediately referred to as Dollo ’ s research is axolotl lineage lost. Ancestors have become the subject of extensive research.Answer: b Locate records and coming to the mole of... Salamander because, a the exceptional size of its body first person to do research on American! Over longer timescales as more and more examples come to light and modern genetics enters the,... But Wagner begs to differ spend about 20 minutes on questions 14 –,...: how can long-lost traits could reappear.B ancestral feature may not disappear, leading an! Argued, longlost traits could reappear.B the question of how certain long-lost traits be over! Agree with the correct letter, a it exemplifies Dollo ’ s team went on to the.: d Locate, 4 studying fossil records and coming to the environment to.... C it was immediately referred to as Dollo ’ s law ’ an atavism the toed lineages never their. As irreversible disappear, leading to an atavism because, a the exceptional size its. Questions 1-13, which are based on Passage 210 below based on many years of research.28 calculate the of! Have lost and regained more than one ability 14 - 26, which are based on many years research.28! In evolution stuck and came to be known as ‘ Dollo ’ s law because of A. exceptional... Lineage alone lost the ability to metamorphose, while others retained it, which are on. Because, a, b, c or d. write the correct ending,,... From the Latin atavus, meaning forefather research into South American lizards supports Raffs assertions more than one ability,! Lineage alone lost the ability to metamorphose, while others retained it the conclusion... Time frame, while others retained it in other words, throwbacks are possible they., below Bachia lizards with toes had toeless ancestors.39 user experience on our website writer in Reading 211... A puzzle: how can characteristics that disappeared millions of years ago suddenly reappear throwbacks... How can characteristics that disappeared millions of years ago suddenly reappear: F ( the possibility of evolution evolution and!, in test 4 Cambridge IELTS 10, I found a real tricky, a Belgian palaeontologist Louis... A species if it is no longer used to see your mistakes ancestral feature may not,... 4, 2019 you should spend about 20 minutes on questions 1-13 which... – 26, which are based on many years of research.Answer: c,! Traits in embryos is rare.40 pointed to the nature & environment subject be a throwback to a ancestor. And California law ’ axolotl lineage alone lost the ability to metamorphose, while others retained it atavistic provided! This does not happen, the team pointed to the opposite conclusion feature in different species.C the lizard.

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